biodegradable – able to decay naturally and harmlessly.
carbon monoxide – the poisonous gas formed by the burning of carbon, especially in the form of car fuel.
climate – the general weather conditions usually found in a particular place.
deforestation – the cutting down of trees in a large area; the destruction of forests by people.
desertification – the process by which land changes into desert.
endangered species – endangered birds/plants/species animals or plants which may soon not exist because there are very few now alive.
environment – the air, water and land in or on which people, animals and plants live.
natural resources – things such as minerals, forests, coal, etc. which exist in a place and can be used by people.
global warming – a gradual increase in world temperatures caused by polluting gases such as carbon dioxide which are collecting in the air around the Earth and preventing heat escaping into space.
renewable energy – describes a form of energy that can be produced as quickly as it is used.
recycle waste – to collect and treat rubbish to produce useful materials which can be used again.